Here is a summary of all the known and confirmed info we have for each of the episodes. This page will updated as we get new info in. Please note that we have a lot of spoilers that we're not sure which episode they belong to currently and as such they have not been included below. They will be updated accordingly when we can assign them to an episode. If you notice any mistakes to know of any spoilers posted that we should assign to specific episodes please leave us a message in the comments below. You locate this page by clicking on Episodes link in the menu.

SynopsisIn the first part of the season premiere, entitled "Because You Left," the remaining island survivors start to feel the effects of the aftermath of moving the island, and Jack and Ben begin their quest to reunite the Oceanic 6 in order to return to the island with Locke's body in an attempt to save their former fellow castaways.

Casting News[Casear]A dangerous, physical and extremely intelligent male between the ages of 35 and 45. Although his intentions are unclear, this much is certain: he's as skillful at charming people as he is at killing them. He also has a dark past..

[Ilanna]a European female in her late 20s to early 30s who possesses great intelligence, but who's also dangerous as all get out. She's alluring and apparently used to getting her own way.

[FOREMAN]40s to 50s, any ethnicity. A blue-collar construction worker. He's worked hard to get where he is and provide for his family. He cares deeply for his crew, hates it when management is condescending and arrogant but ultimately knows his place in the pecking order. CO-STAR.

[MARTHA]35 to 40, Asian, attractive. A smart, capable scientist with a strong personality who has taken a break to raise her baby but plans to work again. Completely believes in the work she is doing but sometimes questions the decisions of those in charge...CO-STAR, RECURRING

[DAN]40s, any ethnicity. A high-priced attorney, someone really sharp who can be friendly. However, there's a real menace lurking below the surface. RECURRING GUEST STAR

SynopsisTHE REMAINING SURVIVORS START TO FEEL THE EFFECTS CAUSED BY THE ISLAND BEING MOVED, AND JACK AND BEN BEGIN THEIR QUEST TO REUNITE THE OCEANIC 6 - ALONG WITH LOCKE'S BODYHurley and Sayid are on the run from the cops after stumbling into trouble at the safehouse; the island survivors come under attack by unknown forces; and an old friend offers some shocking advice to Kate in order to ensure that "the lie" remain a secret.

Casting News[Nigel]British, in his late teens. Smart and mature for his age, if a little rough around the edges.

[Sophie]British aristocrat in her late teens and appears quite innocent and a little prim, but underneath she is formidable.

[DARLENE]Early 20s, any ethnicity. A bored clerk who hates her sucky job and looks for any burst of excitement to get through the shift. Alternative in dress and style, plays guitar in her own band but needs the day job to pay the bills...CO-STAR.

[JILL]Late 20s to late 30s; any ethnicity. A butcher who is one hard-as-nails cool chick. A tomboy, bit of a searcher, and highly competent beyond her station in life...CO-STAR.

[CUNNINGHAM] Mid-20s to Early 30s. Any ethnicity. Athletic, used to living outdoors and off the land. He is a loyal soldier but willing to compromise with the enemy to protect his men...VERY NICE CO-STAR. THIS ROLE IS INTRODUCED IN 502 AND HAS 3 SCENES IN 503.

Casting News[Nigel]British, in his late teens. Smart and mature for his age, if a little rough around the edges.

[Sophie]British aristocrat in her late teens and appears quite innocent and a little prim, but underneath she is formidable.

[CUNNINGHAM] Mid-20s to Early 30s. Any ethnicity. Athletic, used to living outdoors and off the land. He is a loyal soldier but willing to compromise with the enemy to protect his men...VERY NICE CO-STAR. THIS ROLE IS INTRODUCED IN 502 AND HAS 3 SCENES IN 503.

[Abigail]Female, 30s, British; working class. Stoic - but deeply wounded. Has a way with bitter sarcasm, though she's a loyal caregiver at heart...ONE DAY GUEST STAR (Theresa's nurse)

[Theresa]Female, 30s, British, blonde. Pretty suffers from dementia but also has short periods of complete lucidity...ONE DAY GUEST STAR, COULD POSSIBLY RECUR

[SOLANGA]Male, 50s, Filipino. The village doctor in a small, rural community. Has his vices but also genuine medical skills. Speaks relatively good English with an accent...CO-STAR

[JANITOR]Male, late 40s or 50s, must have a British working class accent. Nosy, opinionated, resident rumor monger of a school. Knows everyone's business and can't keep a secret to save his life...NICE CO-STAR

SynopsisKate discovers that someone knows the secret of Aaron's true parental lineage. Meanwhile, the dramatic shifts through time are placing the lives of the remaining island survivors in extreme peril.

Casting News[VINCENT]Early to mid 30s, Caucasian. Owner of a Tunisian bar. Smug and smart, knows he's better than most of his colleagues but has a short temper. Thinks he's a tough guy and gets himself into trouble because of it. MUST SPEAK FRENCH... Guest star.

[ LEON ]Mid to late 20s, Caucasian. Reserved, handsome and talented. A romantic at heart, he finds himself overwhelmed in a stressful job and at odds with a realist. MUST SPEAK FRENCH.. Guest Star.

[TONY] late-20s to early 30s, any ethnicity. Tough, formidable, someone who could take an order and execute it flawlessly. WOULD PREFER A STUNT MAN... Co-star.

[DR. EVELYN ARIZA]30s-40s, any ethnicity. Chief of staff at a hospital. She's attractive with a great bed-side manner but tough and carries her authority well. Not afraid to make difficult decisions...ONE DAY GUEST STAR

Casting News[HAL]70s, Caucasian. Successful, handsome and charming rogue with a twinkle in his eye. A guy who can still fight the establishment and win...GUEST STAR. LIKELY RECURRING.

[MIKE]30s-40s with Czech accent. A scientist. Very intelligent and creative. He's excited to show his boss his latest discovery. Has worked hard and knows he's on the brink of something big...GUEST STAR. MUST HAVE AN AUTHENTIC CZECH ACCENT OR BE ABLE TO DO AN IMPECCABLE CZECH ACCENT.

[VICKI]30s-40s, any ethnicity, attractive. Charming, coy and knows how to get what she wants. Has spent a lifetime in bars and can read a guy better than he knows himself...CO-STAR.

[RUPA]20s, Indian (South Asian), pretty. Sweet, fun-loving professional young woman who can be tougher than she appears. Can deal with difficult customers with charm and ease...CO-STAR.

[NANDI]Male, 30-35, Indian (South Asian) he's smart and professional. He's used to working with difficult and annoying people, so he's developed a kind but firm demeanor...CO-STAR

Casting News[AMY]A smart, attractive and charismatic Caucasian woman somewhere between 35-42 years old. She is outdoorsy and adventurous. She is comfortably successful at her job. Her love life is complicated and a reflection of her own complex nature. She is a woman many men find attractive and she likes qualities of each of her suitors but is looking for the whole package. Other women find her funny and honest. A SIGNIFICANT RECUR OF AT LEAST 4 EPISODES...GUEST STAR

[PHIL]Any ethnicity, mid-20s to mid-40s. Thin, serious, and in usually in a bad mood. Works in corporate security, a task master, runs his teams by the rules. GUEST STAR. Possible recur.

[JERRY]Any ethnicity, mid-20s to mid-30s. A bad boy. Dangerous, charming and always up for a good time. Works in corporate security; can be serious and tough when he needs to be. NICE CO-STAR. Possible recur.

[DOCTOR]Male, any ethnicity, 30s. Smart, hippy-ish, well-trained doctor who finds himself thrown into a situation outside of his medical experience and has to adjust. NICE CO-STAR.

Casting News[MARTY JANKOWSKY]40s to 50s, Caucasian, very smart and controlling. Marty has his own way of doing things and god help you if you cross him and/or try to alter his very precise process. A deep and free thinker he uses his fierce intellect as a weapon. GUEST STAR/POSSIBLE RECUR

[JACK ROSS]30s, any ethnicity. A former air force bomber pilot who now uses his professional skills and unflappable demeanor to maintain order in a highly chaotic environment. He's smart, professional and competent. He keeps his wits as those around him in a crisis are losing theirs. ONE-DAY GUEST STAR

SynopsisLOST - "He's Our You" - Things begin to unravel when one of the survivors goes rogue and takes matters into their own hands -- risking the lives of everyone on the island -- on "Lost," WEDNESDAY, MARCH 25 (9:00-10:02 p.m., ET) on the ABC Television Network. (ABC/MARIO PEREZ)

Casting News[MARTY JANKOWSKY]40s to 50s, Caucasian, very smart and controlling. Marty has his own way of doing things and god help you if you cross him and/or try to alter his very precise process. A deep and free thinker he uses his fierce intellect as a weapon. GUEST STAR/POSSIBLE RECUR

[FATHER]40s, must speak Arabic. A domineering and quick-tempered father who's trying to bring his boys up properly. Feels he has to teach his son a lesson about how to be a real man. CO-STAR.

[OLDER BOY]12, must speak Arabic. Sensitive and kind-hearted, he's scared of his domineering father and knows he's a sad disappointment. CO-STAR.

[IVAN]Late 30s to late 40s, pudgy, must have a Russian accent, wealthy, upper-class and has lived the good life, but gambling debts have caught up with him. Now he fears for his life from the Russian mob. CO-STAR.

[YOUNG BOY] 8, must speak Arabic. Quiet and thoughtful who loves his older brother and is protective of him, can do what his father asks calmly and coolly. CO-STAR.

Casting News[GRAHAM] Caucasian, male, 40. Blue eyes, 6 foot, English/British ONLY, confident, has come into his own and ready to be a leader. He's the SVP of a major financial corporation jockeying for the CEO position...GUEST STAR

[BRIAN]Any ethnicity, late 20s to mid-30s. Smart, charismatic and clever with the ability to be PHYSICALLY IMPOSING. He is wise beyond his years. Capable of genuine charm, he is also the first person you'd want to help you out of any serious jams. LOOKING FOR VERY INTERESTING ACTORS.sptv050769..GUEST STAR, RECURRING.

SynopsisBEN IS TAKEN FROM THE INFIRMARY -- WHICH RAISES SUSPICIONS ABOUT A POSSIBLE SECURITY BREACH, AND MILES IS FORCED TO WORK WITH HURLEY TO DELIVERING AN IMPORTANT PACKAGE TO A TOP DHARMA OFFICIAL

Suspicions about a possible breach intensify after Ben is taken from the infirmary, and a reluctant Miles is forced to work with Hurley when he's asked to deliver an important package to a top Dharma official.

Casting News[HOWARD] Late 40s - late 50s, any ethnicity. Blue-collar, tough-looking. A lonely guy who finds it hard to admit his love for his son. Goes to great lengths to finally bond with him. TWO VERY NICE SCENES - ONE DAY GUEST STAR.

[LITTLE BOY] 8-12 years old, Asian. Precocious and inquisitive, he wanders away from his mom and finds himself in a scary situation but discovers he’s got more fortitude than he ever imagined. CO-STAR.

Casting News[SOPHIE]Late 30's - 40s, BRITISH. Very intelligent, skillful, prim and proper aristocrat yet someone who is tough and resourceful when necessary to protect her family. Looking for actress 5'0" to 5'4" in height for matching requirements. MUST HAVE AN ENGLISH ACCENT... ONE DAY GUEST STAR, PROBABLE RECUR.

[GEORGE]10 years old, very intelligent, sharp and bright. A child prodigy who is already completing high school level work. Extraordinarily gifted as a science student and musician, he still deep down simply wants to make his parents proud and get their love. Looking for someone with brown hair and brown eyes. Please submit actors that can play some piano... CO-STAR

SynopsisJACK AND KATE FAIL TO AGREE ON THE BEST DIRECTION TO TAKE TO SAVE THEIR FELLOW ISLAND SURVIVORS, AND SAWYER AND JULIET COME UNDER SCRUTINY FROM THE DHARMA INITIATIVE

Jack and Kate find themselves at odds over the direction to take to save their fellow island survivors, Locke further solidifies his stance as leader of "The Others," and Sawyer and Juliet come under scrutiny from the Dharma Initiative.

SynopsisJack's decision to put a plan in action in order to set things right on the island is met with some strong resistance by those close to him, and Locke assigns Ben a difficult task, on the season finale of “Lost.”

Casting News[JASON]Any ethnicity, late 30s-60s. Former soldier. A leader of men. Smart but more than that – he is wise. Strong and straightforward. The words he says are always listened to and they carry gravitas. GUEST STAR two episodes. May lead to recurrings. Looking for someone very interesting and very special for this role...

[SAMUEL]Any ethnicity, 40s-60s. A corporate raider looking to take over his next company. Powerful, devious and obtuse. He has a cunning intellect and a strong sense of danger. GUEST STAR two episodes. May lead to recurring. Looking for someone very interesting and very special for this role...

[MITCH]any ethnicity, 30s. A security man with enough intelligence and physical menace to be good at his job, but he's not moving into management. RECURRING, Guest Star.

[YOUNG NATALIE] Caucasian. 10 year-old, blonde, blue-eyed. Strong personality and defiant. Her parents tell her they are divorcing, and Natalie becomes upset and strident. She doesn't want this to happen, and runs to her room crying. CO-STAR.

[YOUNG DONNA] Caucasian. 12-year-old brunette. Natalie's older sister. Tries to act more grown-up and stoic. Can hide her feelings while Natalie acts out. Her parents tell her they are divorcing, and Donna is upset, quietly crying. CO-STAR.

[ALICE] Caucasian. Late 30s. Emotionally strong and tries to keep her feelings in check for her family. Unhappy in her marriage and tasked with telling her two young little girls that she and their father are divorcings. NICE CO-STAR.

[YOUNG EMILY] Caucasian. 10 year-old, brunette. Green eyes. Cute, precocious and confident. Willing to bend the rules to get what she wants. CO-STAR.

[MR. SPRINGER] Caucasian. 50s. Kindly but can be a hard-ass when necessary. Owns his own rural business. Worked hard to get where he is and provide for his family. CO-STAR.

[CAPTAIN BIRD] Any ethnicity, 40s-50s. Professional, military background, intelligent and able. Concerned about the safety of his ship's crew. NICE CO-STAR... THIS ROLE WILL BE IN EP. 515 AND ONE EPISODE OF THE FINALE - THIS ROLE WILL FLY OUT ON THE 10TH